Combined changeable-speed and brake mechanism.



No. 377.404. ,PA'I'ENTED JAN. 21, 1908.

' E. P. BULLARD, JR- COMBINED CHANGEABLE SPEED AND BRAKE MECHANISM.

KPPLIOATION FILED APR. 12, 1906.

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\ E.P.BULLARD,JR. COMBINED OHANGEABLE SPEED AND BRAKE MECHANISM.

APPLICATION FILED APR. 12, 1906.

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No. 877,404. PATENTED JAN. 21, 1908 E. P. BULLARD, JR-

COMBINED GHANGEABLE SPEED AND BRAKE MECHANISM.

APPLICATION FILED APR.1 2, 190s.

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EDWARD P. BULLARD, JR, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE BULLARD MACHINE TOOL COMPANY, OF BRIDGEPORT, CONNECTICUT, A CVRPQRATION OF CON NECTICUT.

CQIIIBINED CHANGEABLE-SPEED AND BRAKE MECHANISM.

To all whom it may concern:

Be it known that I, EDWARD P. BULLARD, Jr., a citizen of the United States, andresident of Bridgeport, in the county of F airfield and State of Connecticut, have invented certain. new and useful Improvements in Combined Changeable-S eed and Brake Mechanism, of which the fol owing is a specification.

My present invention relates to an improved brake, and speed mechanism, to be used in connection with machine tools as for instance lathes, boringmills, etc.

It is the purpose of my invention to combin a brake and changeable speed mechanism for machines in such a manner as to be operated by a single lever and whereby a number of different changes of speeds may be obtained by the adjustment of the lever in one direction, and whereby the movement of the said mechanism may be quickly stopped by an operationof the said lever in another direction; to provide means for readily determining which of the several speeds are engaged and finally to construct the device in as simple and practicable a manner aspossible consistent with the work required.

In the accompanying drawings forming a part of this specification I have shown my invention as applied to one of my improved types of vertical turret lathes, but it will be obviousthat the said invention is equally apsame.

plicable to other forms of machine tools and especially boring mills in connection .With which Ialso use it. I

Similar characters of reference denote like or corresponding parts throughout the several figures of the accompanying drawings,

and of which, I

Figure 1, shows a rear perspective view of a vertical turret lathe having my improved brake and speed changing mechanism applied thereto. Fig. 2, is an enlarged front elevation of my novel mechanism as seen in Fig. 1, the operating lever being shown in its normal position by full lines and in its brakin position by dotted lines. Fig. 3, is an enlarged sectional plan view, of the seriesof clutch gears, and the brake clutch, together with lever, .and connections for operating the Fig. 4, shows a central vertical longi'tudinal section through the said driving gears, clutches, and brake mechanism, taken on line 44 of Fig. 2. Fig. 5, is a similar Specification of Letters Patent. Application filed April 12. 1906- Serial No. 311.285.

Patented'J an. 21, 1908.

detail cross section taken on line 5-5 of Fig. 4," and illustrating the brake clutch which is also shown connected in Fig. 4, to be operated by the lever. Fig. 6, is a detail-cross sectional View taken on line 66 of Fig. 4, illustrating one of the friction clutches shown in said figure and connected to be operated by the lever.

The speed clutches illustrated in connection with the driving gears in the several figures of the drawings are of a preferred design being especially desirable in connection with boring mills and special lat-hes, yet I do not wish to confine myself to the use of any particular style of clutch or gears asa driving medium since other devices may be found equally as good. t

Referring generally to the vertical turret lathe shown in Fig. 1, 10 indicates the frame, 11 a shelf attached-thereto and 12 an electric motor upon the shelf and by means of which the tool may be operated, 13 represents a casing attached to the frame and inclosing the driving gears, clutches and brake.

Power is communicated through any suitable line of connections to the driven shaft 14, see Fig. 4, having a series of varying size gears 15, all of which are connected to be ro- 'tated with the shaft and in turn mesh with and drive gears 16 loosely mounted on special hubs 17 keyed to the shaft 18 journaled in bearings of the casing. These gears 16 are alike in design but are of varying sizes to connect with the driving gears on shaft 14, and thus each comprises a separate connection designed to drive the shaft 18 at a different rate of speed. Each of these gears 16 is provided with a clutch device for operatively connecting said gear and shaft to effect a driving connection from the shaft 14 to the shaft 18 through any one of the different- 22 slidably mounted through end 32 of the slide rod 23L having a bevel enlargement is slidably mounted within a bore of the shaft- 18, and

serves to engage the inner ends of the several gaged, the levers operate to expand the splitv rings against the flan es of the gears, thus forming clutchesito e ect an operative connection intermediate the hub and gear and from one shaft to the other. The changing from one speed to another is effected by simply sliding the rod inward or outward of the shaft to engage the particular clutch desired. as will be fully understood from Figs. 4, 5 and 6.

A bracket 25 is swiveled to the casing 13 and corn rises as ecially shaped piece, having a cy indrical ore 26 therein and a hub portion 27 that is journaled in a round bearmg 28 of the casing, and an extension 29 (see Fig. 3) in which the operating lever 30 is pivoted. Within the cylindrical bore 26 (see Fig. 4) of the bracket is fitted a plunger 31 that contains a socket to receive the inner end of the lever 30 and by means of which said plunger is operated. This plun er further contains a socket to receive the eaded Upon the top of the extension 29 of the'bracket is formed a plate 33 (see Figs. 2 and 3) bearing graduations 34 with which the pointer 35 secured to the rocker stud 36 of the lever registers. There are five of these graduation marks upon the plate each one representing a position of the lever for the engagement of one of the clutches. The operating lever. is designed to be thrown. forward and backward as indicated in full and dotted lines in Fig.3,

or may be adjusted to any intermediate position to engage either of the intermediate clutches. 1

-In addition to the above connection for engaging the several clutches, I also provide brake mechanism, whereby the driving shaft 18 may be readily stopped, by the manipulation' of the same lever 30 which is used for operating the'clutches in the several gears, which brake is as follows: The hub portion 27 contains an enlarged bore 37 to receive the hub 38 of a clutch disk 39. This disk is secured to the shaft 18 by means of a screw 40,

i which attaches it in away to insure its rotation with the shaft at all times when the said shaft is rotated. Upon the periphery of the hub 37 is a lug 41 bearing an adjusting screw designed to impinge against a short arm 42 'rnonnted upon the inner end of a rocker stud 43 pivotally mounted in the casing 13. A

spiit'ring a4 is journaled in and against the peripheral flange of the disk 39 with its two ends abutting against the opposite parallel sides of the upper portion of? the arm From the foregoin construction it will be seen that with a slight rotary movement of the hub pr. tion 37 in the directionoi the arrow Fig. 5, the screw of the lug 41 impinges against and operates the arm 42 in a way to expand the split ring to 'frictionally engage the disk and retard its movement This rotary or braking movement of the hub and the bracket is obviously effected by simply raising the lever as indicated in dotted lines Fig. 2. An extended lug 44 secured to the bracket 25 is designed to engage the side of the web 45 of'the casing 13 in a way to normally'support the bracket 25 and hub in the position shown in Figfi..

.2 and 5, disengaged from the brake di A spring actuated pin 46 secured 'inva socket 47 of the bracket serves to frictionally engage a fixed pin 48 secured in the web 45 of the casing 13 and holds the bracket and leverin their upper or locked positions when adjusted to sheet the braking operation.-

The above mechanism obviously enables the operator to readily shift from one speed to another by a slight horizbntal adjustment of the operating lever toengage the respective clutches and also permits the-brake to be applied very quickly when the lever is in.

aninter'mediate position. If a clutch be engaged the operator wouldfirst shift the lever slightly to disengage the-clutch, and then raise the lever and bracket'i'n a way to turn the-hub and expand the split ring of the brake. clutch, the same being accomplished only gaged.

Having thus" described my invention what I claim and desireto-secure by Letters Patent is:

1. The combination of a changeable speed driving mechanism, a brake clutch connected therewith, a casing in which they are mounted, a bracket pivoted inv the casing connected with and. adapted to operate the when'the clutches were disenbrake, and means carried within the bracket to operate the changeable speed driving mechanism. g,

2. The combination of a shaft, changeable speed driving connections mounted thereon,

a brake clutchalso connected therewith, a

casing in which they are mounted, a bracket movably mounted in the casing, connections therewith for operating the brake, a lever pivoted. in the bracket for operating the same and for engaging the several driving connections.

3. In a driving device, the combination with a shaft, of one or more clutt'ih connections for, operating the same, a brake device upon the shaft, :1 hubbed bracket journaled to operate the brake device, a single lever pivoted in the bracket and connected with both the clutch mechanisms 3 and'brake device for operating. both.

4. In a changeable speed device, the combinationv of aseries of driven gears, a series loose gears to engage the driven gears,

clutches in each of. said loose gears, a

' lever and a graduated plate with which the arm registers.

5. In a changeable speed driving device, the combination with a shaft, a series of changeable speed driving connections, of a friction disk attached to the shaft, a clutch device to engage the disk, a rocker bracket adapted to operate the clutch, a lever to manipulate the bracket and also adapted to operate the several clutches of the driving connections.

6. In a changeable speed driving device, the combination. with a shaft, a series of clutch connections for operating the same, 'a plunger for operating the several driving clutches, a friction rake secured to the shaft, a movable bracket connected withand adapted to operate saidfriction brake, a lever pivoted in the bracket for operating both said braking device and the plunger for the clutches.

7. In a changeable speed'driving device,

the combination with a shaft, of a series of clutch mechanisms for operatively engaging the shaft with driving connections, means for operating the several clutches, adriven brake dlsk secured to said shaft, an expandible ring Within said disk, a movable bracket connected to operate the ring to engage the disk, a lever pivoted in the bracket to operate the plunger and clutches and also adapt= ed to set the friction brake.

8. In a changeable speed device, the combination 'witha shaft and variable speed driving connections, of clutch mechanism for each of said driving connectlons, a plunger for operatmg the several clutches,a

braking clutch mounted upon the same shaft, a rocker bracket journaled upon the shaft to set the clutch of the brake device,

means for manipulating the bracket to operate saidbrake and for operating the plunger of the friction clutches, and means for re taining the bracket in a lockedor braked position.

9. In a changeable speed driving device, the combination with a shaft, a series of driving connections including a friction clutch for each of such connections, a plunger for o era-ting said clutches, a friction brake-dis secured to the shaft, asplit ring within the disk, a rocker stud intermediate the ends of the ring and bearing an arm, a rocker bracket, means for engaging the arm to expand. the ring, and a device for 'With a shaft, changeable speed driving connections bearing clutches for respectively engaging the same, of a brake device comprising a disk fixed to the shaft, an expandile split ring within the disk, a rocker stud to engage the ends of the split ring, a rocker bracket bearing a lug to engage and o erate the stud, a lever mounted in the brac et to manipulate the same for the operation of the brake clutch and also adapted to operate the speed clutches, and means for holding the bracket in its braking position. I

11. The combination with a shaft, connections for operating the same, of a disk secured thereto, a split rin within the disk, a rocker stud fixed with re ation to the movement of the .disk and en agin the ring, a bracket bearing a rotatab e hu and lug to engage the stud, means for operating the bracket to effect such en a ement of the lug and stud, and means for o ding the bracket in such engagement.

12. The combination Witha shaft, connections for operating the same, of a casing in which the shaft is 'ournaled, a disk secured to the shaft, a spht friction ring to engage the disk, a rocker stud mounted in the casing, and extending intermediate of the ends of the split ring, a bracket journaled in the casing bearing a lug to engagethe rocker stud for operating the split ring, a handle connected-with the bracket for o erating the same to lock the bracket, an means for holding said bracket in such locked position.

13. The combination with a shaft and driving connections, of a friction brake, a movable bracket having connections for operating the brake, a lever ivoted in the bracket with means for engaging the several driving connections, 'a pointer and graduations toindicate the engagement of the driving connections, and means for holding the bracket in its adjusted position for locking the brake.

Si ed at Bridgeport, in the county of Fai aid and State of Connecticut this 28th dayof March, A. D., 1906.

v EDWARD P. BULLARD, JR.

Witnesses:

G. N. MOREHOUSE, 1 F. J. LOWENSTEIN. 

